How to select a DC Block
A DC Block is a coaxial component that prevents the flow of DC current into the RF Signal path, thereby minimizing interference. The key specifications to look for when looking for an rf or microwave dc block are:
Type: There are three main types:
Inner DC Blocks: Inner dc blocks have a capacitor in series with the center conductor.
Outer DC Block: Outer dc blocks have a capacitor in series with the outer conductor.
Inner/Outer DC Block: Inner-Outer dc blocks have a capacitor in series with both the inner and outer dc block.
Connector: RF DC blocks are available in a number of connector options – sma dc blocks, bnc dc blocks etc. There are also options available where the input and the output connecters are different.
Impedance: The impedance of the dc block is matched to the circuit impedance to prevent any reflections. 50 Ohms and 75 Ohms are the two most common options.
Frequency (MHz): The frequency up to which the DC Block can effectively block out the DC signal from the RF Signal path.
Power Rating (W): This is the level of power that the dc block can handle.
Breakdown Voltage (V): This is the voltage beyond which the dc block ceases to operate.
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